Plug for electrical conductors.



W? fnzssrss J. W. PHELPS. PLUG FOE ELECTRICAL GONDUGTORS. A'rrmu'uonFILED 1130.5, 1908.

Patented Dec. 13,1910.

'on'irnn STATES PATENT OFFICE.

JAMES W. PHELPS, OF DETRGIT, MICHIGAN.

ILUG FOB ELECTRICAL CONDUCTORS.

Specification of Letters Patent. Patented Dec. 13, 1910.

Application filed December 5, 1908. Serial No. 466,175.

I l t contact E may he revolved to screw the same into the threadedsocket while the member A is held stationary.

The electrical connections for the plug are formed by contacts iii and Xu on opt isite sides of the tlattcncd portion (J of the inenispaces uponopp site sides of the portion C It is an object of the invention toobtain a construction with which the conductors iuav I be easily andsecurely attached to the plug, contacts, and are so located as to avoidthe possibility of short circuit.

her A and clamping screws O for securing the said contacts to the endsof the tlcxihlc conductors This conducoi is the usual cord P, theseparate strands of which pass through apertures in th member .r intothe 7 and are there Secured by the clampin screws 0 to their respectivecontacts M and 1 The contact M has a portion bent over the top of themember 0 and in electrical contact with the bolt 1; which forms aCUllIlBC- It is a further object to provide m ans for revolving thethreaded contact while engaging or disengaging the same. from the socketwithout rotation of the plug or cord.

forth.

In the drawings Figure l is an cnlzwgcd longitudinal section partly ii;elevation through the plug; with the cap member in section n line :1:;c,Fig. 1; Fig. 3 is a section on line y-3 Fig.2. A is a member formed ofinsiclating material, preferably vulcanized rubber which and an upwardlyprojecting flattened post section C. Surrounding the post C is a capsection which comprises a circular insulator tion to the nut K, and thelatter forms the central contact of the plug. The Contact .lHClillJBl Xis arranged -upoii the opposite side of the portion C, ill-ll isprovided with With these objects in view the invention consists in aconstruction as hereinafter set an outwardly extending portion (Q, whichat. its outer cud is turned downward across tliepcriphcr v of theportion, and is inaiiii tained tlii'cadcd contnct int-iuher r1. Thus inevery Fig. 2 is a plan view;

in ticcl'lltztl connection with the position of rotary adjustment of thecontact nicinocr l-I CUHIRCUUI) \\'lll he maintained with the contact XiThe under side of the portion ii is re Icessed and threaded to engage athreaded portion ll of n nicinht-r S formed of insulatis provided with acircular base portion ll ing material. This nicinliei' is ct-nttally upcrturcd for the pns-ago of the cord 1'' therejthrongh, hut this apertureis out of alincthe base portion of which fits about a circulat portion1- of the member A of smaller diameter than the portion B.

G is a-ring of insulating material, which is attached to the nicrnl'icrii, and is seated against the shoulder H of the portion ll.

position a screw 1, which engages a ccn- .Qrnt with tl.-e upt -rturcs'1" and '1" through cap D and a threaded metallic contact l,i

which the strands of the cord pass to the contacts M and i\. By reasonot-thts construction, when the member 5 is screwed into its socket i:will form a clamp which will se urely ip'the lntorally-extending strandI portions i" of the cord 1, so that an stress f applied to this cordwill not be transmitted The members U, la and t aresvcurctl in i time,the clearance space surrounding the.

contacts M and is so large that there is no danger of short circuit by rason of the end of the conductor coming into contact with the metallicpartsait' the plug. After the commions are made. the members D, E and Gare replaced and secured by the nut K. The plug may then be engaged withthe socket by turnin; the member (i, which will rotate the contact ii irelation to the memher A. and permit of engagement with the threadedsocket without any twisting of the ('(Il'tl.

'hat I claim a my invention is:

1. An electrical contact plug comprising a body member having a recessedbase. a member of insulating material having a threaded engagement withsaid rcccss and centrally apertured, contacts mounted upon oppositesides of saizl body member, and flexible conductors connected to saidcontacts'passing through apertures in said hodv member into aid recessand upon opposite sides thereof and then extending laterally throughsaid central aperture whereby said insulating members constitute, aclamp for said conductors.

2. An electrical contact plug comprising a body of insulating materialhavinga trans yersely projecting integral flattened portion of reducedcross section. a metallic contact of rcduccd cross secti n. a metalliccontact Iucnibcr urrounding said flattened portion. spaced therefrom andrcmorably au'iycled upon said body. and .ucans upon opposite Sltltfi ofsaid flattened portion and in the space iucloscd by said metalliccontact for attaching the conductor to the flattened por tion.

-l. .\n electrical contact plug comprising a body of insulating materialbaring a transycrscly projecting integral llattcncd portion. a threadedcontact member surrounding said flattened portion. spaced therefrom andremoiably .'i\'clcd up n said body, and tersaid projection. one. of saidconnections havin; a laterally ext nding p rtion projecting intoengagement with the. threaded contact.

5. .\n electrical contact plug comprising a body of in ulating ma ialharinga transrcrscly projecting integral flattened portion. a rerolulilethreaded contact member swirelcd upon said body. a stationary contactmcmhcr carried by said projection, and 1 terminal connections uponopposite sides of said projection, one or said connections l W- ing alaterally extending flange engaging the tationar contact member. l i

6. An electrical contact plug'coznprising a hotly of insaiating materialharing an integral tans-rerscly projecting fiattened 391" tion, arcroluhle threaded contact member, swivclcd upoi i 'caid body, aninsulating cap for said rnenifir. a stationary contact projectingoutwardly through said integral pro: jection and cap and forming meansfor clamping tire tl'ireaiiled Contact to the body portion and terminalconnections secured to opposite sides of said flattened portion, one ofsaid connections having a laterally extending portion positionedintermediate the end of the integral projection of the body and the capand engaging said stationary contact.

T. An electrical contact plug comprising a body of in ulatiug materialhavinga trans- \'cr-"ely projectingintegral flattened portion.v

a threaded contact mentber surrounding said flattened portion. spacedtherefrom and 'reniovably swiveled upon said body. and terminalconnections upon opposite sides of said projection. one of saidconnections having a laterally extending portion projecting intoengagement uith the threaded contact, and the other of said terminalconnections having a portion projecting into tngagement with thethreaded contact.

3. .\n electrical contact plug comprising a body of insulating materialharinga trans \'cr.-ely pr iecting portion of reduced crosscction. athreaded contact member swireled up n said body portion. an in .latingcap fixedly secured to the end of said threaded contact member. and astationary contact mcmber paning through said body trans- (l'sclyprojecting portior. and. cap and forming a mean for securing thethreaded contact to the body.

9. in electrical contact pluIr. comprising a hudy member having spacedapertures. contacts carried hy said body member. a member of insulatingmaterial having a screw-tbrea ed engag ment with the body inci-ibcr andcentral y apcrtured. said apertures hem; out of ahnement with each ofsaid spaced apertures. and flexible conducihrongh said spaced apertures.and then extending laterally and through said central apert u re.

in testimony whereof I afl'ix my signature in presence oftwo witnesses.

JAMES .V. PHELPS.

'itncsaes:

NELLIE Krnsnnna, W. J. Baum.

; t -rs connected to the contacts and passing niinal connections uponopposite sidca ot'l

